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Listar por autor "Fernandez Rosell, Carmen"

Mostrando ítems 1-13 de 13

Atomic decompositions and frames in Fréchet spaces and their duals

Ribera Puchades, Juan Miguel (Universitat Politècnica de València, 2015-05-11)

[EN] The Ph.D. Thesis "Atomic decompositions and frames in Fréchet spaces and their duals" presented here treats different areas of functional analysis with applications. Schauder frames are used to represent an arbitrary ...
Atrial fibrillation subtypes classification using the General Fourier-family Transform

Ortigosa, Nuria; Cano, O.; Ayala Gallego, Guillermo; Galbis Verdu, Antonio; Fernandez Rosell, Carmen (Elsevier, 2014-04)

Atrial fibrillation patients can be classified into paroxysmal, persistent and permanent attending to the temporal pattern of this arrhythmia. The surface electrocardiogram hides this differentiation. A classification ...
Dynamics and spectra of composition operators on the Schwartz space

FERNÁNDEZ ROSELL, CARMEN; GALBIS VERDU, ANTONIO; Jorda Mora, Enrique (Elsevier, 2018)

[EN] In this paper we study the dynamics of the composition operators defined in the Schwartz space of rapidly decreasing functions. We prove that such an operator is never supercyclic and, for monotonic symbols, it is ...
Early prediction of cardiac resynchronization therapy response by non-invasive electrocardiogram markers

Ortigosa, Nuria; Pérez-Roselló, Víctor; Donoso, Victor; Osca Asensi, Joaquín; Martínez-Dolz, Luis; Fernández Rosell, Carmen; Galbis Verdu, Antonio (Springer-Verlag, 2018-04)

[EN] Cardiac resynchronization therapy (CRT) is an effective treatment for those patients with severe heart failure. Regrettably, there are about one third of CRT "non-responders", i.e. patients who have undergone this ...
Estudio sobre transformadas tiempo-frecuencia aplicables al análisis de electrocardiogramas. Desarrollo de una aplicación con Guide de Matlab para la obtención de señales de electrocardiogramas en formato PDF

Giménez Solano, Vicente Miguel (Universitat Politècnica de València, 2014-11-25)

[EN] In this paper we analyze a particular type of biomedical signals: the electrocardiogram (ECG). To analyze these signals, a very powerful digital processing technique are time-frequency transforms. With them, ECG leads ...
Frames and representing systems in Fréchet spaces and their duals

Bonet Solves, José Antonio; Fernandez Rosell, Carmen; Galbis Verdu, Antonio; Ribera Puchades, Juan Miguel (Duke University Press, 2017)

[EN] Frames and Bessel sequences in Fr\'echet spaces and their duals are defined and studied. Their relation with Schauder frames and representing systems is analyzed. The abstract results presented here, when applied to ...
Frames de Gabor: el principio de dualidad de Ron y Shen

Primo Tárraga, Eva (Universitat Politècnica de València, 2015-07-17)

[EN] We introduce the frame theory and the ir relationship with Riesz bases. We focus on the study of Gabor frames and conclude with the Ron-Shen duality principie
Gabor frames for classification of paroxysmal and persistent atrial fibrillation episodes

Ortigosa, Nuria; Galbis Verdu, Antonio; Fernández, Carmen; Cano-Pérez, Óscar (Elsevier, 2017-01)

[EN] In this study, we propose a new classification method for early differentiation of paroxysmal and persistent atrial fibrillation episodes, i.e. those which spontaneously or with external intervention will return to ...
Operadores pseudodiferenciales en clases no cuasianalíticas de tipo Beurling

Jornet Casanova, David (Universitat Politècnica de València, 2015-09-22)

Los operadores pseudodiferenciales son generalizaciones de los operadores integrales singulares y de los operadores en derivadas parciales con coeficientes variables. A cada operador le corresponde un símbolo, que es una ...
Operators on wighted spaces of holomorphic functions

Beltrán Meneu, María José (Universitat Politècnica de València, 2014-03-24)

The Ph.D. Thesis ¿Operators on weighted spaces of holomorphic functions¿ presented here treats different areas of functional analysis such as spaces of holomorphic functions, infinite dimensional holomorphy and dynamics ...
Phase information of time-frequency transforms as a key feature for classification of atrial fibrillation episodes

Ortigosa, Nuria; Fernandez Rosell, Carmen; Galbis Verdu, Antonio; Cano-Pérez, Óscar (IOP Publishing, 2015-03)

[EN] Patients suffering from atrial fibrillation can be classified into different subtypes, according to the temporal pattern of the arrhythmia and its recurrence. Nowadays, clinicians cannot differentiate a priori between ...
Spectrum of composition operators on S(R) with polynomial symbols

Fernández, Carmen; Galbis, Antonio; Jorda Mora, Enrique (Elsevier, 2020-05-13)

[EN] We study the spectrum of operators in the Schwartz space of rapidly decreasing functions which associate each function with its composition with a polynomial. In the case where this operator is mean ergodic we prove ...
The range of the restriction map for a multiplicity variety in Hörmander algebras of entire functions

Bonet Solves, José Antonio; Fernandez Rosell, Carmen (Springer Verlag (Germany), 2014-05)

[EN] Characterizations of interpolating multiplicity varieties for Hörmander algebras Ap(C) and A0 p(C) of entire functions were obtained by Berenstein and Li (J Geom Anal 5(1):1–48, 1995) and Berenstein et al. (Can J Math ...